From 15b397aed71323e3f6a08d91a490ebca1dfc4087 Mon Sep 17 00:00:00 2001
From: Folkert van Heusden <mail@vanheusden.com>
Date: Sun, 6 Apr 2025 22:10:48 +0200
Subject: [PATCH] also intercept PWriteB

---
 PDP11/pdp11_cpu.c | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/PDP11/pdp11_cpu.c b/PDP11/pdp11_cpu.c
index 439fbb85..c5c9e5de 100644
--- a/PDP11/pdp11_cpu.c
+++ b/PDP11/pdp11_cpu.c
@@ -281,7 +281,7 @@ typedef struct {
 
 struct __mem_writes {
 	int32_t addr;
-	uint16_t data;
+	uint8_t data;
 } *mem_writes;
 int n_mem_writes = 0;
 
@@ -290,6 +290,24 @@ void init_mem_writes()
 	mem_writes = (struct __mem_writes *)malloc(sizeof(struct __mem_writes) * 256);
 }
 
+void put_mem_write(uint8_t data, uint32_t pa)
+{
+	int i = 0;
+	int found = 0;
+	for(i=0; i<n_mem_writes; i++) {
+		if (mem_writes[i].addr == pa) {
+			mem_writes[i].data = data;
+			found = 1;
+			break;
+		}
+	}
+	if (found == 0) {
+		mem_writes[n_mem_writes].addr = pa;
+		mem_writes[n_mem_writes].data = data;
+		n_mem_writes++;
+	}
+}
+
 uint16 *M = NULL;                                       /* memory */
 int32 REGFILE[6][2] = { {0} };                          /* R0-R5, two sets */
 int32 STACKFILE[4] = { 0 };                             /* SP, four modes */
@@ -2838,23 +2856,8 @@ void reset_mem_writes()
 void PWriteW (int32 data, int32 pa)
 {
 if (ADDR_IS_MEM (pa)) {                                 /* memory address? */
-
-	int i = 0, found = 0;
-	if (data > 0xffff)
-		printf("FAIL %x\n", data);
-
-	for(i=0; i<n_mem_writes; i++) {
-		if (mem_writes[i].addr == pa) {
-			mem_writes[i].data = data;
-			found = 1;
-			break;
-		}
-	}
-	if (found == 0) {
-		mem_writes[n_mem_writes].addr = pa;
-		mem_writes[n_mem_writes].data = data;
-		n_mem_writes++;
-	}
+	put_mem_write(data, pa);
+	put_mem_write(data >> 8, pa + 1);
 
     WrMemW (pa, data);
     return;
@@ -2873,6 +2876,8 @@ return;
 void PWriteB (int32 data, int32 pa)
 {
 if (ADDR_IS_MEM (pa)) {                                 /* memory address? */
+	put_mem_write(data, pa);
+
     WrMemB (pa, data);
     return;
     }